A NOVEL APPROACH TO FIND OPTIMIZED NEUTRON ENERGY GROUP STRUCTURE IN MOX THERMAL LATTICES USING SWARM INTELLIGENCE

• Published in: Nuclear engineering and technology Vol. 45; no. 7; pp. 951 - 960
• Main Authors: AKBARI, M., KHOSHAHVAL, F., MINUCHEHR, A., ZOLFAGHARI, A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2013; Elsevier; 한국원자력학회
• Subjects: Energy Group Structure; MOX Thermal Lattices; Optimization; WIMS Library; 원자력공학; WIMS Library; Energy Group Structure; MOX Thermal Lattices; Optimization
• ISSN: 1738-5733; 2234-358X
• DOI: 10.5516/NET.01.2012.005

Energy group structure has a significant effect on the results of multigroup transport calculations. It is known that UO2–PUO2 (MOX) is a recently developed fuel which consumes recycled plutonium. For such fuel which contains various resonant nuclides, the selection of energy group structure is more crucial comparing to the UO2 fuels. In this paper, in order to improve the accuracy of the integral results in MOX thermal lattices calculated by WIMSD-5B code, a swarm intelligence method is employed to optimize the energy group structure of WIMS library. In this process, the NJOY code system is used to generate the 69 group cross sections of WIMS code for the specified energy structure. In addition, the multiplication factor and spectral indices are compared against the results of continuous energy MCNP-4C code for evaluating the energy group structure. Calculations performed in four different types of H2O moderated UO2–PuO2 (MOX) lattices show that the optimized energy structure obtains more accurate results in comparison with the WIMS original structure.